descriptor.c

最新的libusb库

/*
 * USB descriptor handling functions for libusb
 * Copyright (C) 2007 Daniel Drake <[e-mail]>
 * Copyright (c) 2001 Johannes Erdfelt <[e-mail]>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include <errno.h>
#include <stdlib.h>
#include <string.h>

#include "libusbi.h"

#define DESC_HEADER_LENGTH		2
#define DEVICE_DESC_LENGTH		18
#define CONFIG_DESC_LENGTH		9
#define INTERFACE_DESC_LENGTH		9
#define ENDPOINT_DESC_LENGTH		7
#define ENDPOINT_AUDIO_DESC_LENGTH	9

/** @defgroup desc USB descriptors
 * This page details how to examine the various standard USB descriptors
 * for detected devices
 */

/* set host_endian if the w values are already in host endian format,
 * as opposed to bus endian. */
int usbi_parse_descriptor(unsigned char *source, char *descriptor, void *dest,
	int host_endian)
{
	unsigned char *sp = source, *dp = dest;
	uint16_t w;
	char *cp;

	for (cp = descriptor; *cp; cp++) {
		switch (*cp) {
			case 'b':	/* 8-bit byte */
				*dp++ = *sp++;
				break;
			case 'w':	/* 16-bit word, convert from little endian to CPU */
				dp += ((unsigned long)dp & 1);	/* Align to word boundary */

				if (host_endian) {
					memcpy(dp, sp, 2);
				} else {
					w = (sp[1] << 8) | sp[0];
					*((uint16_t *)dp) = w;
				}
				sp += 2;
				dp += 2;
				break;
		}
	}

	return sp - source;
}

static void clear_endpoint(struct libusb_endpoint_descriptor *endpoint)
{
	if (endpoint->extra)
		free((unsigned char *) endpoint->extra);
}

static int parse_endpoint(struct libusb_context *ctx,
	struct libusb_endpoint_descriptor *endpoint, unsigned char *buffer,
	int size, int host_endian)
{
	struct usb_descriptor_header header;
	unsigned char *extra;
	unsigned char *begin;
	int parsed = 0;
	int len;

	usbi_parse_descriptor(buffer, "bb", &header, 0);

	/* Everything should be fine being passed into here, but we sanity */
	/*  check JIC */
	if (header.bLength > size) {
		usbi_err(ctx, "ran out of descriptors parsing");
		return -1;
	}

	if (header.bDescriptorType != LIBUSB_DT_ENDPOINT) {
		usbi_err(ctx, "unexpected descriptor %x (expected %x)",
			header.bDescriptorType, LIBUSB_DT_ENDPOINT);
		return parsed;
	}

	if (header.bLength >= ENDPOINT_AUDIO_DESC_LENGTH)
		usbi_parse_descriptor(buffer, "bbbbwbbb", endpoint, host_endian);
	else if (header.bLength >= ENDPOINT_DESC_LENGTH)
		usbi_parse_descriptor(buffer, "bbbbwb", endpoint, host_endian);

	buffer += header.bLength;
	size -= header.bLength;
	parsed += header.bLength;

	/* Skip over the rest of the Class Specific or Vendor Specific */
	/*  descriptors */
	begin = buffer;
	while (size >= DESC_HEADER_LENGTH) {
		usbi_parse_descriptor(buffer, "bb", &header, 0);

		if (header.bLength < 2) {
			usbi_err(ctx, "invalid descriptor length %d", header.bLength);
			return -1;
		}

		/* If we find another "proper" descriptor then we're done  */
		if ((header.bDescriptorType == LIBUSB_DT_ENDPOINT) ||
				(header.bDescriptorType == LIBUSB_DT_INTERFACE) ||
				(header.bDescriptorType == LIBUSB_DT_CONFIG) ||
				(header.bDescriptorType == LIBUSB_DT_DEVICE))
			break;

		usbi_dbg("skipping descriptor %x", header.bDescriptorType);
		buffer += header.bLength;
		size -= header.bLength;
		parsed += header.bLength;
	}

	/* Copy any unknown descriptors into a storage area for drivers */
	/*  to later parse */
	len = (int)(buffer - begin);
	if (!len) {
		endpoint->extra = NULL;
		endpoint->extra_length = 0;
		return parsed;
	}

	extra = malloc(len);
	endpoint->extra = extra;
	if (!extra) {
		endpoint->extra_length = 0;
		return LIBUSB_ERROR_NO_MEM;
	}

	memcpy(extra, begin, len);
	endpoint->extra_length = len;

	return parsed;
}

static void clear_interface(struct libusb_interface *interface)
{
	int i;
	int j;

	if (interface->altsetting) {
		for (i = 0; i < interface->num_altsetting; i++) {
			struct libusb_interface_descriptor *ifp =
				(struct libusb_interface_descriptor *)
				interface->altsetting + i;
			if (ifp->extra)
				free((void *) ifp->extra);
			if (ifp->endpoint) {
				for (j = 0; j < ifp->bNumEndpoints; j++)
					clear_endpoint((struct libusb_endpoint_descriptor *)
						ifp->endpoint + j);
				free((void *) ifp->endpoint);
			}
		}
		free((void *) interface->altsetting);
	}
	
}

static int parse_interface(libusb_context *ctx,
	struct libusb_interface *interface, unsigned char *buffer, int size,
	int host_endian)
{
	int i;
	int len;
	int r;
	int parsed = 0;
	int tmp;
	struct usb_descriptor_header header;
	struct libusb_interface_descriptor *ifp;
	unsigned char *begin;

	interface->num_altsetting = 0;

	while (size >= INTERFACE_DESC_LENGTH) {
		struct libusb_interface_descriptor *altsetting =
			(struct libusb_interface_descriptor *) interface->altsetting;
		altsetting = realloc(altsetting,
			sizeof(struct libusb_interface_descriptor) *
			(interface->num_altsetting + 1));
		if (!altsetting) {
			r = LIBUSB_ERROR_NO_MEM;
			goto err;
		}
		interface->altsetting = altsetting;

		ifp = altsetting + interface->num_altsetting;
		interface->num_altsetting++;
		usbi_parse_descriptor(buffer, "bbbbbbbbb", ifp, 0);
		ifp->extra = NULL;
		ifp->extra_length = 0;
		ifp->endpoint = NULL;

		/* Skip over the interface */
		buffer += ifp->bLength;
		parsed += ifp->bLength;
		size -= ifp->bLength;

		begin = buffer;

		/* Skip over any interface, class or vendor descriptors */
		while (size >= DESC_HEADER_LENGTH) {
			usbi_parse_descriptor(buffer, "bb", &header, 0);
			if (header.bLength < 2) {
				usbi_err(ctx, "invalid descriptor of length %d",
					header.bLength);
				r = LIBUSB_ERROR_IO;
				goto err;
			}

			/* If we find another "proper" descriptor then we're done */
			if ((header.bDescriptorType == LIBUSB_DT_INTERFACE) ||
					(header.bDescriptorType == LIBUSB_DT_ENDPOINT) ||
					(header.bDescriptorType == LIBUSB_DT_CONFIG) ||
					(header.bDescriptorType == LIBUSB_DT_DEVICE))
				break;

			buffer += header.bLength;
			parsed += header.bLength;
			size -= header.bLength;
		}

		/* Copy any unknown descriptors into a storage area for */
		/*  drivers to later parse */
		len = (int)(buffer - begin);
		if (len) {
			ifp->extra = malloc(len);
			if (!ifp->extra) {
				r = LIBUSB_ERROR_NO_MEM;
				goto err;
			}
			memcpy((unsigned char *) ifp->extra, begin, len);
			ifp->extra_length = len;
		}

		/* Did we hit an unexpected descriptor? */
		usbi_parse_descriptor(buffer, "bb", &header, 0);
		if ((size >= DESC_HEADER_LENGTH) &&
				((header.bDescriptorType == LIBUSB_DT_CONFIG) ||
				 (header.bDescriptorType == LIBUSB_DT_DEVICE)))
			return parsed;

		if (ifp->bNumEndpoints > USB_MAXENDPOINTS) {
			usbi_err(ctx, "too many endpoints (%d)", ifp->bNumEndpoints);
			r = LIBUSB_ERROR_IO;
			goto err;
		}

		if (ifp->bNumEndpoints > 0) {
			struct libusb_endpoint_descriptor *endpoint;
			tmp = ifp->bNumEndpoints * sizeof(struct libusb_endpoint_descriptor);
			endpoint = malloc(tmp);
			ifp->endpoint = endpoint;
			if (!endpoint) {
				r = LIBUSB_ERROR_NO_MEM;
				goto err;
			}

			memset(endpoint, 0, tmp);
			for (i = 0; i < ifp->bNumEndpoints; i++) {
				usbi_parse_descriptor(buffer, "bb", &header, 0);

				if (header.bLength > size) {
					usbi_err(ctx, "ran out of descriptors parsing");
					r = LIBUSB_ERROR_IO;
					goto err;
				}

				r = parse_endpoint(ctx, endpoint + i, buffer, size,
					host_endian);
				if (r < 0)
					goto err;

				buffer += r;
				parsed += r;
				size -= r;
			}
		}

		/* We check to see if it's an alternate to this one */
		ifp = (struct libusb_interface_descriptor *) buffer;
		if (size < LIBUSB_DT_INTERFACE_SIZE ||
				ifp->bDescriptorType != LIBUSB_DT_INTERFACE ||
				!ifp->bAlternateSetting)
			return parsed;
	}

	return parsed;
err:
	clear_interface(interface);
	return r;
}

static void clear_configuration(struct libusb_config_descriptor *config)
{
	if (config->interface) {
		int i;
		for (i = 0; i < config->bNumInterfaces; i++)
			clear_interface((struct libusb_interface *)
				config->interface + i);
		free((void *) config->interface);
	}
	if (config->extra)
		free((void *) config->extra);
}

static int parse_configuration(struct libusb_context *ctx,
	struct libusb_config_descriptor *config, unsigned char *buffer,
	int host_endian)
{
	int i;
	int r;
	int size;
	int tmp;
	struct usb_descriptor_header header;
	struct libusb_interface *interface;

	usbi_parse_descriptor(buffer, "bbwbbbbb", config, host_endian);
	size = config->wTotalLength;

	if (config->bNumInterfaces > USB_MAXINTERFACES) {
		usbi_err(ctx, "too many interfaces (%d)", config->bNumInterfaces);
		return LIBUSB_ERROR_IO;
	}

	tmp = config->bNumInterfaces * sizeof(struct libusb_interface);
	interface = malloc(tmp);
	config->interface = interface;
	if (!config->interface)
		return LIBUSB_ERROR_NO_MEM;

	memset(interface, 0, tmp);
	buffer += config->bLength;
	size -= config->bLength;

	config->extra = NULL;
	config->extra_length = 0;